Nail expansion



July 22, 1930. H. w. PL EISTER ET AI 1,771,233

RA L EXPANSION Filod; Aug; 20. 1926 TORNEY Patented July 22, 1930 UNITED STATES PATENT OFFICE HENRY W. PLEISTER, OF VTESTFIELD, AND JOHN KARI'IZKY, OF GARWOOD, NEW

JERSEY, ASSIGNORS, BY DIRECT AND MESNE ASSIGNMENTS, TO HENRY B. NEW- HALL CORPORATION, OF GARVIOOID, NEW J ER-SEY, A CORPORATION OF NEW J EBSEY NAIL EXPANSION Application filed August 20,1223. Serial No. 130,390.

Our invention relates to expansion bolts, and more particularly to a nail expansion shield formed of wire or similar material the wire being either round, flat, or any other form.

Our invention further relates to a wire shield, the cross-section of which is less than a complete circle, to permit an expanding member to engage with the shield and also with the walls of the hole in which the shield is mounted.

Our invention further relates to a wire shield formed of a plurality of disconnected wire units.

Our invention further relates to an expansion shield formed of a primary and a secondary unit, the units being nested parallel to each other.

Our invention further relates to certain articles of manufacture and combination which will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings the same reference numerals refer to similar parts in the several figures.

Fig. 1 is a perspective view of a wire unit;

Fig. 2 is a side elevation of the primary unit shown in Fig. 1;

Fig. 3 is a plan view of the primary unit shown in Fig. 2;

Fig. 4 is a perspective View of the secondary unit to be nested with the primary unit, Fig. 1;

Fig. 5 is a side elevation of the complete wire shield formed of the primary and secondary units nested;

Fig. 6 is a front elevation taken 90 from the position shown in Fig. 5;

Flg. 7 is a horizontal section on the line 1616 of Fig. 6; I

Fig. 8 is a vertical section showing the expanding member being inserted into the wire shield;

Fig. 9 is a horizontal section.

In our invention the wire shield is formed of a primary unit 18 and a secondary unit 19. The primary unit is shown detached in Figs. 1 to 3 and is formed from a length of commercial soft wire of any suitable 'contour bent to form the head member 20 and the longitudinally extending strands 21 and V .The strand 21 is bent back on itself to form the longitudinally extending strand 23, the end of that strand being bent below the level of the loop head member '20 to. form the head member 24. The strand 22 is bent back on itself to form thelongitudinally extending strand 25, the end of this strand being bent below the level of the loop head member 20 to form the head member 26.

The secondary unit 19 (Fig. 4) is formed from a-similar length of commercial soft wire to form the outwardly extending loop head member 27 and the longitudinally extending strands 28 and 29. The end of the strand 23 is bent back sharply upon itself to form the strand .30 which is preferably not as long as the strand 28; In the same manner the end of the strand 29 is bent backupon itself to form a short strand 31. i

The two units'18 and 19 are nested and brought. into cooperation with each other by bringing the loops32, 32 of the secondary unit 19 in line with the openings 33, 33 between the difierent strands 21, 23 and 22 and 25 of.;the primary unit.

The interval 34 (Fig. 4) betweenthe loops 32, 32 of the sec- "ondary unit is just sufficient to straddle the strands 21 and 23 and 22 and 25 of the primary unit and to exert a slight pressure tending to force the strands 21, 23 and strands 22 the exterior surface of the strands of the first unit, as shown more clearly in Figs. 6 and 7.

having the head members 24 and 26 of the primary unit 18 below the head member 20 of that unit permits the head member 27 ofthe secondary unitto be brought to rest on th 0 head members 24; and 26 of the primary unit and be substantially flush with the head member 20 of that unit, as shown in Fig. 5.

. The'different units 18 and 19 may, if desired, be separately positioned in the hole 9 of the support 10 so as to hold the work 12 to the surface 40 of the support. Preferably, iowever, the different units will be nested as shown in Fig; 5, which would be their assembled and commercial shipping position.

lVhen the expanding member, as for example, the nail 13 is driven into the complete wire shield formed of the two units 18 and 19, the ditferent longitudinally extending strands of each of the units will be forced radially by the nail and make a firm hold or bond with the surface lt of the hole.

lVhile we have shown a smooth nail, it is to be understood that the nail may be provided with a roughened surface, and that a threaded bolt provided with square or countersunk head may be employed lnstead of a nail. It

will be noted that my expansion shield may be made at minimum cost, that it is simple and will give the maximum efficiency for a given size shield. It is further to be noted that the different wire shields, or wire units, are each open constructions, which will freely allow galvanizing by the hot process.

Having thus described this invention in connection with illustrative embodiments thereof, to the details of which we do not desire to be limited, what is claimed as new and what is desired to secure by Letters Patent is set forth in the appended claims.

\Vhat we claim is:

1. A new article of manufacture comprising a wire expansion shield formed of a primary wire unit having a plurality of longitudinally extending strands of wire separated from each other, and a secondary wire unit adapted to be nested on the exterior of the strands of the primary unit and parallel to said strands.

2. A new article of manufacture comprising a wire expansion shield formed of a primary resilient wire unit having a plurality of longitudinally extending strands of wire separated from each other, and a secondary resilient wire unit having a plurality of longitudinally extending strands of wire adapted to be nested on the exterior of thestrands of the primary unit and force the strands of that unit towards each other to yieldingly hold the two wire units together.

A new article of manufacture comprising a wire expansion shield formed of a primary wire unit and a secondary wire unit, head members on the primary unit, one head member being lower than the other head member, and a head member on the secondary unit adapted to rest on the lower head member of the primary unit.

4. A new article of manufacture comprising a wire expansion shield formed of a primary wire unit having a plurality of longitudinally extending strands, and a secondary wire unit unattached to the first unit engaging and cooperating with the exterior surfaces of the longitudinally extending strands of the first unit and held thereon by spring pressure.

5. The combination of a wire expansion shield formed of a primary wire unit and a secondary wire unit, head members on the primary unit one head member being lower than the other head member, and a head memher on the secondary unit adapted to rest on the lower head member of the primary unit, and an expanding member having a head adapted to engage with a head member on each of the primary and secondary units.

HENRY lV. PLEISTER. JOHN KARITZKY. 

